Printing apparatus



June 11, 1963 M. B. BEAVER PRINTING APPARATUS Filed Jan. 30, 1962 2Sheets-Sheet l ATTORNEYS June 11, 1963 M. B. BEAVER PRINTING APPARATUS 2Sheets-Sheet 2 Filed Jan. 30, 1962 ELE-E ATTORNEYS This inventionrelates generally to printing apparatus, and more particularly to aprinting apparatus employing type :formed of resilient material, such asrubber, for

printing indicia or symbols on flat, irregular or curved surfaces.

Commodities such as beverages, crearns, pastes and the like areconventionally packaged in metal, plastic and cardboard containers, :andit is frequently desirable to imprint on such containers certainvariable indicia, such As the commodities are packaged, in the usualinstance they are conveyed at high speed along -a certain path to aboxing station; however, before reaching this station, an indicia mustbe printed on each individual package or container. It is important thateven though the print- As a matter of 20 ing operation occurs at highspeed, still the printing be performed with such clarity that it `can beeasily read in eaoh and every instance. One of the problems in the useof prior art printing devices is that printing lat high speed, theindicia becomes smeared or smudged so :as not to be clearly legible.

It is therefore an object of this invention to provide an improvedprinting apparatus employing type formed of resilient material fordistinctly imprinting indicia at la high rate of speed on containersurfaces whether they be itat, irregular or curved.

It i-s another object of this invention to provide an irnproved printingapparatus capable of supporting type formed of resilient material inwhich containers being imprinted will be held stationary relative to thetype while an imprinting operation is being performed.

It is still another object of this invention to provide a printingapparatus which employs resilient strip means for preventing anytwisting movement of .a container during yan imprinting operationwhereby the imprint will be clear and legible.

Other objects Iwill become apparent as the description proceeds.

The above-mentioned and other features :and objects of this inventionand the manner of :attaining them will Patented June 1l, 1963 FIG. 8 isa side elevation of the strip of FIG. 7.

Referring to the drawings, there is shown a wheellike type holder,generally indicated by the reference numeral 10, having an outer rimportion 12 with a web portion 14 integrally joined thereto, these rim:and web portions 12 yand 14 being formed of any suitable metal, such assteel. A central hub portion 16 is integrally 'connected to the webportion 14 and is adapted to be `secu-red to any type of a rotarysupport which is rotatable about an axis indicated by the numeral 18.'Ihe wheel 10 i-s conventionally provi-ded with a radial slot 20 havingcircumferentially spaced sides 22 and 24, respectively, the slot 2lipenetrating to the center of the wheel as shown for purposes ofattaching the wheel to suitable rotary `supporting structure (notshown).

The rim 12 of the wheel is provided with three ici-rcumferenti-allyextending grooves 26, 28 and 30" which are `axially spaced apart, thesegrooves extending radially inwardly from the outer peripheral surface ofthe wheel 10. As shown more clearly in FIGS. 3 and 4, the -wheel 10 isprimarily disc-like in shape with the outer surface thereof beingcylindrical and symmetrical .about the Wheel axis 15.

The two grooves 26 and 28 are of substantially the same depth and aredisposed adjacent to the outer sides, respectively, of the wheel 10. Thegroove 28 is positioned intermediate the two grooves 26 and 30 :as shownmore clearly in FIGS. 3 and 4 and extends :substantially parallelthereto. In other words, the three grooves 26, 28 and 3i) are paralleland axially spaced on the wheel 10i.

The opposite sides of the center groove 28 are provided, respectively,with laterally extending circumferential slots 32 `and 34 which areintermediate the radial extremities of the sides. By this means, acircumferential undercut 36 is provided which is -disposed radiallyinwardly from the two :slots 32 and 34.

In the sides 22 tand 24 of the radial slot 20, at the radially outerextremities thereof are provided two notches 38 `and 40 respectively,the back sides of these notches 0 being radial and the bottom 4sidecircumferential. 'I'he become more lapparent and the invention itselfwill be 55 best understood by .reference to the following description ofan embodiment of the invention taken in oonjunction with thelaccompanying drawings, wherein:

FIG. l is a side elevation of an embodiment of this I FIG. 7 is a topplan view of the rubber-stabilizing 70 strip which is a part of theassembly of FIG. 1; and

back and bottom sides, respectively, of these two notches are preferablyat right tangles to each other `so :as to receive two elongatedchannel-shaped retainers 42 and 44, respectively, which are held inplace by means of suitable screws `46 received by threaded openings inthe bottoms ofthe notches. These brackets 42 `and 44 extend transverselyof the wheel 1li as shown Iand have a flength coincides with the spacingbetween the two outer grooves 26 and 30 as shown.

As shown more clearly in FIG. 6, the slot or groove provided in thebracket 42 coincides with the adjacent ends of the two grooves 26 and 30and the purpose of this coincidence will become apparent from thefollowing deiscription.

A stabilizing strip generally indicated by the reference numeral 48(FIGS. 7 and 8) of resilient, rubber-like material is molded to theshape as shown in FIGS. 7 and 8. This shape comprises t-wo elongatedside legs 50 and 52 which are parallel and which are spaced apart adistance equal to the spacing of the two wheel grooves 26 and 36, andtwo end bars 54 an'd 56, respectively, which `connect the ends of thetwo side legs 50 and 52 together. There are six elongated ridge portions58 formed on eachside leg 50 'and 52 as shown, these ridge portionsbeing of a certain uniform height throughout their length and spacedapart as shown. This height as Well as the spacing will become lapparentfrom the description which is to follow.

The stabilizing strip 48 of FIGS. 7 and 8 is made to a length whichequals or is just slightly shorter than the circumferential distance onthe surface of the wheel 10 extending between the two channel-shapedbrackets 42.

As shown more clearly in FIGS. 1 through 4, the side legs S and S2 ofthe stript 48 fit into the respective grooves 26 and 30 while the endbars 54 and 56 fit into the channel-shaped brackets 42 and 44,respectively. With the length of the strip 48 being slightly shorterthan the circumferential dimensions between the two brackets 42 and 44,this dimension -being taken counterclockwise from bracket 42 around tothe bracket 44, it is seen that the stabilizing strip 48 will bestretched slightly so as to be tightly nested and tted into the Wheelgrooves 26 and 30. Preferably, the grooves 26 and 30 are made of suchsize as to receive snugly the side legs 50 and 52 of the stabilizingstrip.

When the stabilizing strip 48 is properly Wrapped around the wheel inthe Igrooves 26 and 30, respectively, the ridge portions 58 radiallyextend outwardly from the peripheral surface of the wheel 10 as shownmore clearly in FIG. 1. As is also more clearly shown in FIG. 1, theridge portions 58 will be circumferentially spaced apart.

The stabilizing strip 48 is also provided with a plurality of laterallyextending key portions 60 which are integral with the two side legs 50and 52 and which are positioned about midway between Ithe ends of therespective ridge portions 58. These keys 60 fit into lateral recesses 62in the inner walls of the two grooves 26 and 30, the shapes of the keys60 and recesses 62 being complementary so as to provide for intimateengagement therebetween. By means of these key and recess connections,the side legs 50 and 52 are positioned circumferentially ofthe wheel 10and are held against relative movement.

As shown more clearly in FIGS. 1, 3 and 4, the ridge portions 58 of thestabilizing strip 48 lie in substantially the same circumferentialsurface. The importance of this `feature will become apparent from thefollowing description.

A plurality of segments 64 of rubber type are positioned in the centergroove 28 of the wheel at circumferentially spaced points, these pointsbeing in registry with the laterally aligned ridge portions 58. Eachsegment of type 64 in cross-section is generally H-shaped with theopposite ends of the base leg 66 tting into the circumferential slots 32and 34, respectively, as shown more clearly in FIG. 3. The cross-bar 68of the type segment extends radially outwardly between the oppositesides of the Igroove 28 and connects to the top bar 7) of the segmentwhich is positioned in the embodiment shown radially beyond theperipheral surface of the wheel 10. The type characters are carried bythe top leg 70, representative characters being shown in FIG. 2.

The segment 64 is positioned in transverse alignment with the ridgeportions 58 of the stabilizing stripas shown more clearly in FIG. 2. Inorder to hold the type segment in this position, end plates or clamps 72are litted into the circumferential slots 32 and 34 as more clearlyshown in FIGS. 2 and 4. These end clamps 72 consist of small, atmetallic plates which fit into the slots 32 and 34 as shown in FIG. 4and which have threaded openings which receive screws '74 therethrough.These screws 74 bear against suitable plastic discs 76 fitted againstthe bottom side 36 of the groove 28 (FIG. 4) whereby the plates 72 maybe securely locked in position. By locking :the two plates 72 inposition, the type segment 64 is held against endwise movement.

As shown more clearly in FIGS. 3 and 4, the outer peripheries of theridge portions 58 as well as the type segments 64 lie in about or in thesame circumferential surface; however, for different printingapplications, the type segment 70 may extend radially outwardly beyonder radially inside this surface depending upon whether r not thecontainer to be imprinted has a convex or con- :ave surface.

In operation, the wheel 10 with the stabilizing strip 43 and the varioustype segments 64 fastened thereto is mounted on a shaft or mechanism torotate at a high rate of speed around the axis 18. Containers orpackages to be imprinted are passed beneath the wheel 10 at about thesame lineal speed as that of the periphery of the Wheel l0, each articlebeing engaged by a transverse pair of ridge portions 58 and therespective type segment 64. The ridge portions 58 prevent the containerfrom moving relative to the wheel while the face of the type segment 64is pressed thereagainst, whereupon a clear imprint is obtained. If aprinting operation is attempted without the ridge portions 58, thecontainer being irnprinted tends to twist or move as it is engaged bythe type segment, thereby producing a smeared or Smudged imprint. Theridge portions 58 stabilize the container against such movement, wherebya clear imprint is obtained in every instance of printing.

After a certain period of usage, the stabilizing strip 43 may wear out,in which event it is only necessary to remove the strip from therespective grooves 26 and 3l) and replace it with a new one. Inconnection with the changing of type segment 64, it is only necessary towithdraw forcefully each type segment from the inner groove 28 landreplace it by a new type segment. All of these replacement operationsiare quick and easy, thereby conducing to the eiiciency and economy ofutilizing the present invention.

While I have described above the principles of my invention inconnection with specific apparatus, it is to be clearly understood thatthis description is made only by way of example and not as a limitationto the scope of my invention.

What is claimed is:

1. A printing device comprising a rigid wheel having an outer peripheralsurface, said wheel having three axially spaced circumferential groovesin said peripheral surface, the center groove comprising two oppositeside walls having intermediate the ends thereof two facingcircumferential slots, a segment of rubber type fitted into the centergroove, said segment in cross-section being generally H-shaped andhaving base and top legs connected by a cross-bar, the opposite ends ofsaid hase leg fitting respectively into said circumferential slots, saidcross-bar extending outwardly between said side walls and said top legbeing disposed radially outwardly of said peripheral surface, a radialslot provided in said wheel extending radially inwardly from saidperipheral surface, a pair of facing transversely extending notchesprovided in the opposite sides of said radial slot, said notches beingadjacent to said peripheral surface, two elongated U-shaped bracketsfitted into said pair of notches, respectively, with the open sidesthereof facing each other, a rubber strip having two elongated paralleland spaced apart side legs which are connected together at the endsthereof by two opposite end legs respectively, said side legs beinginserted into the two outer grooves in said peripheral surface with saidend legs being received by said two brackets, respectively, said sidelegs having a plurality of ridge portions which are elongated andcircumferentially spaced apart on said wheel, said ridge portionsextending radially outwardly from said peripheral surface, the ridgeportions on said side legs being transversely opposite each other withtwo of said ridge portions being transversely opposite said segment oftype, and a plurality of circumferentially spaced recesses provided inthe walls of said outer grooves in regions transversely opposite saidridge portions, said side legs having a plurality of projections thereonwhich intimately iit into said recesses for holding said side legsagainst longitudinal movement.

2. The printing device of claim l but including a plurality of segmentsof rubber type, each segment being elongated and generally H-shape incross-section, each segment having base and top legs connected by acrossbar, the opposite ends of said base leg fitting, respectively, intosaid circumferential slots, said cross-bar extending outwardly betweensaid side walls and said top leg being disposed radially outwardly ofsaid peripheral surface, each said segment being between twotransversely opposite ridge portions, two abutment members abutting theopposite ends of one segment, each abutment member having side portionsfitting into said circumferential slots, and a screw passing througheach abutment member and operatively engaging the bottom of said centergroove for securing the abutment member in place.

3. A printing device comprising a rigid wheel having an outer peripheralsurface, said wheel having three axially spaced circumferential groovesin said peripheral surface, the center groove comprising two oppositeside walls having intermediate the ends thereof two facingcircumferential slots, a radial slot provided in said wheel extendingradially inwardly from said peripheral surface, a pair of facingtransversely extending notches provided in the opposite sides `of saidradial slot, said notches being adjacent to said peripheral surface, twoelongated U- shaped brackets fitted into said pair of notches,respectively, with the open sides thereof facing each other, a rubberstrip having two elongated parallel and spaced apart side legs which areconnected together lat the ends thereof by two opposite end legsrespectively, said side legs being inserted into the two outer groovesin said peripheral surface with said end legs being received by said twobrackets respectively, said side legs having a plurality of ridgeportions which are elongated and circumferentially spaced apart on saidwheel, said ridge portions extending radially outwardly from saidperipheral surface, the ridge portions on said side legs beingtransversely opposite each other, and a plurality of circumferentiallyspaced recesses provided in the walls of said outer grooves in regionstransversely opposite said ridge portions, said side legs having aplurality of projections thereon which intimately fit into said recessesfor holding said side legs against longitudinal movement.

4. A printing device comprising a rigid wheel having an outer peripheralsurface, said Wheel having three axially spaced circumferential groovesin said peripheral surface, the center groove comprising two oppositeside walls having intermediate the ends thereof two facingcircumferential slots, a radial slot provided in said wheel extendingradially inwardly from said peripheral surface, a pair of facingtransversely extending notches provided in the opposite sides of saidradial slot, said notches being adjacent to said peripheral surface, twoelongated U-shaped brackets fitted into said pair of notches,respectively, with the open sides thereof facing each other, a rubberstrip having two elongated parallel and spaced apart side legs which areconnected together at the ends thereof by two opposite end legsrespectively, said side legs being inserted into the two outer groovesin said peripheral surface with said end legs being received by said twobrackets respectively, said side legs having a plurality of ridgeportions which are elongated and circumferentially spaced apart on saidwheel, said ridge portions extending radially outwardly from saidperipheral surface, the ridge portions on said side legs beingtransversely opposite each other.

5. A printing device comprising a wheel having an outer peripheralsurface, said wheel having three axially spaced circumferential groovesin said peripheral surface, a radial slot provided in said Wheelextending radially inwardly from said peripheral surface, a pair offacing transversely extending notches provided in the opposite sides ofsaid radial slot, said notches'being adjacent to said peripheralsurface, two elongated U-shaped brackets fitted into said pair ofnotches, respectively, with the open sides thereof facing each other, arubber strip having two elongated parallel and spaced apart side legswhich are connected together at the ends thereof by two opposite endlegs respectively, said side legs being inserted into the two outergrooves in said peripheral surface with said end legs being received bysaid two brackets respectively, said side legs having a plurality ofridge portions which are elongated and circumferentially spaced apart onsaid wheel, said ridge portions extending radially outwardly from saidperipheral surface, Kthe ridge portions on said side legs beingtransversely opposite each other.

6. A printing device comprising a wheel having an outer peripheralsurface, said wheel having three axially spaced circumferential groovesin said peripheral surface, a radial slot provided in said wheelextending radially inwardly from said peripheral surface, a pair ofretaining members on the opposite sides of said radial slot, saidretaining members extending toward each other, a rubber strip having twoelongated parallel and spaced apart side legs which are connectedtogether at the ends thereof by two opposite end legs respectively, saidside legs being inserted into the two outer grooves in said peripheralsurface with said end legs being received over said retaining membersrespectively, said side legs having a plurality of ridge portions whichare elongated and circumferentially spaced apart on said wheel, saidridge portions extending radially outwardly from said peripheralsurface, the ridge portions on said side legs being transverselyopposite each other.

7. A printing device comprising a wheel having an outer peripheralsurface, s-aid wheel having at least two axially spaced circumferentialgrooves in said peripheral surface, means for attaching type to saidperipheral surface, a radial slot provided in said wheel extendingradially inwardly from said peripheral surface, a pair of retainingmembers on the opposite sides of said radial slot, said retainingmembers extending toward each other, arubber. strip having two elongatedparallel and spaced apart side legs which are connected together at theends thereof by t-wo opposite end legs respectively, said side legsbeing inserted into the two outer grooves in said peripheral surfacewith `said end legs being received over said retaining membersrespectively, said side legs having a plurality of ridge portio-ns whichare elongated and circumferentially spaced apart on said wheel, saidridge portions extending i radially outwardly from said peripheralsurface, the ridge portions on said side legs being transverselyopposite each other.

8. A printing device comprising a wheel having anY outer peripheralsurface, said wheel having at least one radial slot therein extendingradially inwardly from said peripheral surface, a rubber strip havingtwo elongated parallel and spaced apart side legs which are connected.

together at the ends thereof by two opposite end legs, respectively,said side legs engaging and extending circum- 'ferentially around saidperipheral surface, said end legs fittin g into said slot and engagingthe sides thereof respectively `for retaining said rubber strip on saidperipheral surface, and means for securely attaching type to theperiphery of s-aid wheel in between said side legs, said means beingdisposed radially inside the outermost perimetral portions lof said sidelegs whereby the latter may serve as stabilizers.

9. A printing device comprising a wheel having an outer peripheralsur-face, said wheel having at least one p radial slot therein extendingradially inwardly from said perimetral portions of said side legswhereby the latter may serve as stabilizers, and means for holding saidside legs against circumferential movement on said peripheral surface.

l0. A printing device comprising a wheel `having an outer peripheralsurface, said wheel having at least one radial slot therein extendingradially inwardly from said peripheral surface, a rubber strip havingtwo elongated parallel and spaced apart side legs which are connectedtogether at the ends thereof by two opposite end legs, respectively,said side legs engaging and extending circumferentially around saidperipheral surface, said end legs fitting into said slot and engagingthe sides thereof respectively for retaining said rubber strip on saidperipheral surface, means for securely attaching type to the peripheralportion of said wheel in between said side legs, said means beingdisposed radially inside the outermost perimetral portions of said sidelegs whereby the latter may serve as stabilizers, means for holding saidside legs against circumferential movement on said peripheral surface,and means retaining said side legs against transverse movement on saidperipheral surface.

1l. For use in printing apparatus, a stabilizing strip of resilientrubber-like material comprising two elongated side legs which are spacedapart and parallel, said side legs also being rectangular incross-section, two end bars integrally connected between the oppositeends of said side legs respectively, said end bars being at right anglesto said side legs, a plurality of ridge portions on one side of saidside legs, said ridge portions being elongated and longitudinally spacedapart, said ridge portions on the different legs being transverselyopposite each other respectively and extending parallel outwardly in thesame direction from a plane extending between said side legs, and aplurality of key portions projecting laterally inwardly toward eachother from facing sides of said side legs, said key portions beingopposite respective ones of said ridge portions.

l2. For use in printing apparatus, a stabilizing strip of resilientrubber-like material comprising two elongated side legs which are spacedapart and parallel, two end bars integrally connected between theopposite ends of said side legs respectively, said end bars being atright angles to said side legs, a plurality of ridge portions on oneside of said side legs, said ridge portions being elongated andlongitudinally spaced apart, said ridge portions on the different legsbeing transversely opposite each other respectively and extendingparallel outwardly in the same direction from a plane extending betweensaid side legs.

13. For use in printing apparatus, a stabilizing strip of resilientrubber-like material comprising two elongated side legs which -arespaced apart and parallel, two end bars integrally connected between theopposite ends of said side legs respectively, a plurality of ridgeportions on one side of said side legs, said ridge portions beingelongated and longitudinally spaced apart, said ridge portions on thedifferent legs being transversely opposite each other respectively andextending outwardly in the same direction from a plane extending betweensaid side legs.

14. A printing device comprising a wheel having an outer peripheralsurface, said wheel having at least one coaxial circumferential groovein said peripheral surface, said groove comprising two opposite sidewalls having two facing circumferential slots therein, respectively,said slots extending laterally away from each other, a segment of rubbertype fitted into said groove, said segment having a length extendingcircumferentially of said wheel, said segment in cross-section beinggenerally Hshaped and having base and top legs connected by a cross-bar,the opposite ends of said base leg fitting respectively into saidcircumferential slots, said cross-bar extending outwardly between saidside walls and said top leg being disposed radially outwardly of saidperipheral surface, and two deformable rubber strips coaxially mountedon said wheel and extending radially outwardly from said peripheralsurface, said two strips being on opposite sides respectively of saidgroove and having outer peripheries which lie in about the sameimaginary circumferential surface as the outer portion of said top leg.

15. The printing device of claim 14 wherein said two slots areinterposed intermediate the ends of the respective side walls therebyspacing said base leg from the bottom of said groove.

16. A printing device comprising a wheel having an outer peripheralsurface, said wheel having at least one coaxial circumferential groovein said peripheral surface, said groove comprising two opposite sidewalls having two facing circumferential slots therein, respectively,said slots extending laterally away from each other, a segment of rubbertype fitted into said groove, said segment having a length extendingcircumferentially of said wheel, said segment in cross-section beinggenerally H-shaped and having base and top legs connected by across-bar, the opposite ends of said base leg fitting respectively intosaid circumferential slots, said cross-bar extending outwardly betweensaid side walls and said top leg being disposed radially outwardly ofsaid peripheral surface, and two deformable elongated rubber stripsdetachably mounted on said wheel and extending radially outwardly fromsaid peripheral surface, said two strips being on opposite sidesrespectively of said groove and having length dimensions extendingcircumferentially of said wheel, said strips each having one radiallyoutwardly extending ridge portion which is transversely aligned withsaid segment, said ridge portions having outer surfaces which lie inabout the same circumferential surface as the outer surface of said topleg, the portions of said strips on opposite ends of said ridge portionsbeing shorter radially than said ridge portions.

17. A printing device comprising a rigid wheel having an outerperipheral surface, said wheel having three axially spacedcircumferential grooves in said peripheral surface, the center groovecomprising two opposite side walls having intermediate the ends thereoftwo facing circumferential slots, a rubber strip having two elongatedparallel and spaced apart side legs which are connected together at theends thereof by two opposite end legs respectively, said side legs beinginserted into the two outer grooves in said peripheral surface, means onsaid wheel for receiving and retaining said end legs, respectively, forholding said side legs in the respective grooves, said side legs havinga plurality of ridge portions which are elongated and circumferentiallyspaced apart on said wheel, said ridge portions extending radiallyoutwardly from said peripheral surface, the ridge portions on said sidelegs being transversely opposite each other.

18. A printing device comprising a wheel having an outer peripheralsurface, a rubber strip having two elongated parallel and spaced apartside legs which are connected together at the ends thereof by twoopposite end legs, respectively, said side legs engaging and extendingcircumferentially around said peripheral surface, means on said wheelfor receiving said end legs and retaining said rubber strip on saidperipheral surface, and means for securely attaching type to theperiphery of said wheel in between said side legs, said means beingdisposed ra* dially inside the outermost perimetral portions of saidside vlegs whereby the latter may serve as stabilizers.

19. A printing device comprising a wheel having an outer peripheralsurface, said wheel having at least one coaxial circumferential groovein said peripheral surface, said groove comprising two opposite sidewalls having two facing circumferential slots therein, respectively,said` slots extending laterally away from each other, a segment ofrubber type fitted into said groove, said segment having a lengthextending circumferentially of said wheel, said segment in cross-sectionhaving a base leg provided with an upstanding cross-bar, the oppositeends of said base leg fitting, respectively, into and being retained bysaid circumferential slots, said cross-bar extending outwardly betweensaid side walls to a position beyond said periph-t eral surface, thebottom of said groove being spaced from said base leg to thereby providefor radial flexing of the latter, and two deformable elongated rubberstrips detachably mounted on said wheel and extending radially out 10Wardy from said peripheral surface, said two strips being ReferencesCited in the file of this patent on opposite sides respectively of saidgroove and having UNITED STATES PATENTS length dimensions extendingcircumferentially of said wheel, said strips each having one radiallyoutwardly exgltgreu Fgtl tending ridge portion which is transverselyaligned with 5 346489 MGMaS-n" nAug' 3 1886 said segment, said ridgeportions having outer surfaces 423394 Saxton :Mar. '11 1890 which lie inabout the same circumferential surface as the 5691096 .Edy Oct. 5: 1897outer surface yof said top leg, the portions of said strips on 2,004,136Schultz June 1.1, 1935 Opposite ends of said ridge portions beingshorter radially 10 2,746,389 Alessi et al May 22, 1956 than said ridgeportions. 2,779,272 Davidson Jan. 29, 1957

6. A PRINTING DEVICE COMPRISING A WHEEL HAVING AN OUTER PERIPHERALSURFACE, SAID WHEEL HAVING THREE AXIALLY SPACED CIRCUMFERENTIAL GROOVESIN SAID PERIPHERAL SURFACE, A RADIAL SLOT PROVIDED IN SAID WHEELEXTENDING RADIALLY INWARDLY FROM SAID PERIPHERAL SURFACE, A PAIR OFRETAINING MEMBERS ON THE OPPOSITE SIDES OF SAID RADIAL SLOT, SAIDRETAINING MEMBERS EXTENDING TOWARD EACH OTHER, A RUBBER STRIP HAVING TWOELONGATED PARALLEL AND SPACED APART SIDE LEGS WHICH ARE CONNECTEDTOGETHER AT THE ENDS THEREOF BY TWO OPPOSITE END LEGS RESPECTIVELY, SAIDSIDE LEGS BEING INSERTED INTO THE TWO OUTER GROOVES IN SAID PERIPHERALSURFACE WITH SAID END LEGS BEING RECEIVED OVER SAID RETAINING MEMBERSRESPECTIVELY, SAID SIDE LEGS HAVING A PLURALITY OF RIDGE PORTIONS WHICHARE ELONGATED AND CIRCUMFERENTIALLY SPACED APART ON SAID WHEEL, SAIDRIDGE PORTIONS EXTENDING RADIALLY OUTWARDLY FROM SAID PERIPHERALSURFACE, THE RIDGE PORTIONS ON SAID SIDE LEGS BEING TRANSVERSELYOPPOSITE EACH OTHER.